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Colorado River Below E.V. Spence: Investigating Sources of Chloride and Total Dissolved Solids

A project to identify the source of the increasing salt content (chloride and total dissolved solids concentrations), through a field investigation of the Colorado River below E.V. Spence Reservoir.


The Colorado River below E.V. Spence Reservoir is impaired for total dissolved solids (TDS), sulfates, and chloride, which are all components of salinity (salt content). Two TMDLs were completed in 2007 with the goal of identifying sources of saline inflows, improving water quality in the river, and implementing management measures to address them.

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Project Description

The Upper Colorado River Authority will inventory and test water wells in this watershed for TDS, sulfates, and chloride, and map the results. This project will also review Texas Railroad Commission records of oil and gas activities conducted in the area.  If high levels of salinity can be linked to an activity, an abatement or remediation plan will be developed.

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For More Information

To find out more about the NPS Program, call 512-239-6682 or e-mail us at nps@tceq.texas.gov.

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